Abstract: The mined-out areas were filled with aggregates of whole tailings backfilling materials with excellent performance，high utilization rate of tailings，low energy consumption and low cost.According to the existing filling process of a mine，the aggregate fill technology in which the whole tailings replace the grade tailings can optimize the original cementing material and increase the solid concentration of tailings backfill slurry from 68% to 72%.The self-flowing transportation of whole tailings backfill material can be realized with the combination of superplasticizer.The effects of different dosage of four superplasticizers (naphthalene superplasticizer，polycarboxylate superplasticizer，aminosalfonic superplasticizer and aliphatic amino superplasticizer) on bleeding rate，rheological property，and strength of the whole tailings backfill slurry were investigated.The experiment results showed that the addition of superplasticizers effectively improved flow property and retard setting time，but it was disadvantageous to compressive strength.On the whole，SAF with the content of 1.6% not only substantially increased the flow property but also had little negative effect on compressive strength.SAF is the best superplasticizer to prepare the whole tailings backfilling materials and realize the self-flowing transportation.

Key words: Backfilling materials, Whole tailings, Superplasticizer, Rheological property